Date: 2007/01/17 Speaker: Bas Kooijman Title: DEB-based body mass spectra for planktontic consumers The body mass spectrum of consumers can in principle be derived on the basis of the Dynamic Energy Budget (DEB) theory using the assumptions of steady state in homogeneous environments, prey size selection that is linked to the body size of the predator and an exponential frequency distribution of maximum body sizes. The intra- and inter-specific scaling relationships of the DEB theory convert this frequency distribution into a body-mass-specific abundance via a structure-specific abundance. We can evaluate the age-dependent growth, reproduction and survival patterns, and the number of trophic levels as functions of nutrient recycling and nutrient load. I will discuss progress so far.